Both 萌 (ほう, sprout) and 出 (しゅつ, emerge) are On'yomi. It means the act of sprouting, germination, or emergence, typically referring to plants breaking through the soil or teeth appearing. ほうが is a different word, and めだし is a Kun'yomi misreading.

萌（ほう）と出（しゅつ）は共に音読みです。芽が生え出ること、または歯が生え始めること。ほうがは別の単語、めだしは訓読みでの誤読です。